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Today I discovered the most useless piece of my HVAC system: the Static Pressure Regulating Damper. The purpose of this is to release extra air pressure when only one of my two zones are requesting cooling. This makes sense when you're concerned about overall system noise, but not when I could care less about noise when it's at the expense of cooling speed. The insulation on this install prevents the weights from ever closing it fully anyway, defeating the entire purpose of it. I zip-tied it permanently closed for a much faster cooling with slightly louder noise and regret nothing.